/Engine/Source/Runtime/Engine/Classes/Materials/MaterialExpression.h
Copy the SrcExpressions into the specified material, preserving internal references. New material expressions are created within the specified material.
static void CopyMaterialExpressions ( const [TArray](API\Runtime\Core\Containers\TArray)< class [UMaterialExpression](API\Runtime\Engine\Materials\UMaterialExpression) * > & SrcExpressions, const [TArray](API\Runtime\Core\Containers\TArray)< class [UMaterialExpressionComment](API\Runtime\Engine\Materials\UMaterialExpressionComment) * > & SrcExpressionComments, class [UMaterial](API\Runtime\Engine\Materials\UMaterial) * Material, class [UMaterialFunction](API\Runtime\Engine\Materials\UMaterialFunction) * Function, [TArray](API\Runtime\Core\Containers\TArray)< class [UMaterialExpression](API\Runtime\Engine\Materials\UMaterialExpression) * > & OutNewExpressions, [TArray](API\Runtime\Core\Containers\TArray)< class [UMaterialExpression](API\Runtime\Engine\Materials\UMaterialExpression) * > & OutNewComments )